First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV

Strauch, S. et al. (2015) First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV. Physics Letters B, 750, pp. 53-58. (doi:10.1016/j.physletb.2015.08.053)

Strauch, S. et al. (2015) First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV. Physics Letters B, 750, pp. 53-58. (doi:10.1016/j.physletb.2015.08.053)

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Abstract

First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E , for the reaction View the MathML source, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-L multipoles contribute. The data have been included in new multipole analyses resulting in updated nucleon resonance parameters. We report updated fits from the Bonn–Gatchina, Jülich–Bonn, and SAID groups.

Item Type:Articles
Keywords:Baryon spectroscopy, Pion photoproduction, Polarization observables, FROST experiment.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sokhan, Dr Daria and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Fegan, Mr Stuart and Montgomery, Dr Rachel and Glazier, Dr Derek and Protopopescu, Dr Dan and Ireland, Professor David and MacGregor, Professor I and Rosner, Professor Guenther
Authors: Strauch, S., Briscoe, W.J., Doring, M., Klempt, E., Nikonov, V.A., Pasyuk, E., Ronchen, D., Sarantsev, A.V., Strakovsky, I., Workman, R., Adhikari, K.P., Adikaram, D., Anderson, M.D., Anefalos Periera, S., Anisovich, A.V., Badui, R.A., Ball, J., Batourine, V., Battaglieri, M., Bedlinskiy, I., Benmouna, N., Biselli, A.S., Brock, J., Brooks, W.K., Burkert, V.D., Cao, T., Carlin, C., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Colerani, L., Cole, P.L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., Dasjyan, N., D'Angelo, A., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J.A., Forest, T.A., Fradi, A., Gevorgyna, N., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S.M., Ilyeva, Y., Ireland, D.G., Ishkanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joo, K., Joosten, S., Keith, C.D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Kuhn, S.E., Lenisa, P., Livingston, K., Lu, H.Y., MacGregor, I.J.D., Markov, N., McKinnon, B., Meekins, D.G., Meyer, C.A., Mokeev, V., Montgomery, R.A., Moody, C.I., Moutarde, H., Movsisyan, A., Munevar, E., Munoz Camacho, C., Badel-Turonski, P., Net, L.A., Niccolai, S., Niculescu, G., Niculescu, I., O'Reilley, G., Osipenko, M., Ostrovidov, A.I., Park, K., Peng, P., Phelps, W., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Ripani, M., Ritchie, B.G., Rizzo, A., Rosner, G., Roy, P., Sabatie, F., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seely, M.L., Senderovich, I., Sharabian, Y.G., Simonyan, A., Skorodumina, I., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stoler, P., Stepanyan, S., Sytnik, V., Taiuti, M., Tian, Y., Trivedi, A., Tucker, R., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., and Zonta, I.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Nuclear Physics
Journal Name:Physics Letters B
Journal Abbr.:PLB
Publisher:Elsevier
ISSN:0370-2693
ISSN (Online):1873-2445
Published Online:28 August 2015
Copyright Holders:Copyright © 2016 Elsevier B.V.
First Published:First published in Physics Letters B 750: 53-58
Publisher Policy:Reproduced under a Creative Commons License

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